JPH0819030A - Carrier sense method and radio equipment using the mehtod - Google Patents

Abstract

PURPOSE:To avoid the effect due to noise generated from the radio equipment itself by stopping the operation of the equipment itself tentatively prior to radio transmission of voice and data and sensing a carrier after the tentative stop. CONSTITUTION:A control circuit section 11 operates a timer circuit section 16 for a prescribed time in the case of communication to allow itself to be stopped tentatively. When the timer circuit section 16 expires, an interrupt circuit section 15 interrupts the control circuit section 11 and the control circuit section 11 uses a radio control section 2 to sense a carrier just after the re- operation (within 2-3msec after restart of the control circuit section 11). Thus, the control circuit section 11 is stopped tentatively and senses a carrier just after the re-operation, then accurate carrier sensing is attained before the radio section 3 reacts on noise generated by the control circuit section 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is incorporated in a wireless device such as a cordless telephone or a specified low power radio, and receives a carrier wave to generate a frequency
The present invention relates to a carrier sense method for detecting whether or not a channel is vacant and a wireless device using this method.

[0002]

2. Description of the Related Art Conventionally, the structure of a carrier sense method and a radio apparatus using this method will be described with reference to FIG. The control circuit unit 1 is a control unit having a built-in program for performing carrier sense. The wireless control unit 2 is a control unit that detects whether or not a frequency / channel is vacant. If the carrier is detected, the wireless controller 2 is using the channel, and if the carrier is not detected,
It is determined that the channel is empty. The wireless unit 3 is a wireless unit that uses the antenna 4 to perform voice or data communication for an unused frequency / channel.

Next, the operation of the above configuration will be described with reference to FIG. The control circuit unit 1 operates the wireless control unit 2 during voice / data communication. The radio control unit 2 detects whether or not a carrier is present at the frequency received by the radio unit 3 to determine whether or not the frequency / channel to be transmitted by itself is vacant.

As described above, the above conventional carrier sensing method and the wireless device using this method perform carrier sensing at the start of a call to catch a vacant frequency / channel, thereby realizing the above carrier sensing method and this method. A wireless device such as a cordless telephone or a specific low power radio in which the used wireless device is incorporated has an effect of being able to make a call using this frequency / channel.

[0005]

However, in the above-described conventional carrier sensing method and the radio apparatus using this method, the control circuit unit 1 generates noise during carrier sensing, and this noise circulates around the antenna 4 and the like. There is a problem that the carrier becomes difficult to detect and accurate carrier sensing cannot be performed. Especially recently, CPU
However, there is a problem in that the noise of the control circuit unit 1, which is the CPU, tends to increase as the speed increases. The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide an excellent carrier sensing method for performing accurate carrier sensing without being affected by noise in a control circuit section, and a wireless device using this method. To do.

[0006]

In order to achieve the above object, the present invention is configured so that the operation of the device itself is temporarily stopped before wirelessly transmitting voice and data, and carrier sense is performed after the temporary stop. Is.

In order to achieve the above-mentioned object, the present invention provides a wireless device with a timer circuit section, an interrupt control section for interrupting when the timer circuit section times out, and whether or not a frequency / channel is available. A wireless control unit for detecting, a wireless unit for receiving a carrier wave and performing voice or data communication with the above-mentioned available frequency / channel, and at the time of starting carrier sensing, the timer circuit unit is operated and the circuit unit itself is stopped. A control circuit section for performing carrier sensing by the wireless control section when the interrupt control section makes an interrupt is provided.

[0008]

According to the present invention, by the above means, the control circuit section is temporarily stopped during the voice / data communication, and the carrier sense is performed immediately after the control circuit section operates again, so that the influence of noise generated from the apparatus itself can be prevented. It is something to avoid.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration block diagram of a wireless device according to the present embodiment. In FIG. 1, the control circuit unit 11 is
It is a control means that contains a program for performing carrier sense. The wireless control unit 2 is a control unit that detects whether or not a frequency / channel is vacant. The wireless unit 3 is a wireless unit that uses the antenna 4 to perform voice or data communication for an unused frequency / channel. The interrupt control unit 15 is an interrupt unit for the control circuit unit 11, and the interrupt causes the control circuit unit 11 in the suspended state to restart. The timer circuit unit 16 operates as a timer for a fixed time (5 to 10 msec in this embodiment) at the start of carrier sensing, and when the time-out occurs, the interrupt control unit 15 causes the control circuit unit 11 to perform an interrupt operation.

Next, the operation of the above embodiment will be described. In the above embodiment, the control circuit unit 11 during communication is
The timer circuit unit 16 is operated for a certain period of time, and the control circuit unit 1
1 Put itself in a suspended state. The interrupt circuit unit 15 controls the control circuit unit 1 when the timer circuit unit 16 times out.
1 is interrupted, and the control circuit unit 11 restarts. The control circuit unit 11 performs carrier sensing by the wireless control unit 2 immediately after the re-operation (within 2 to 3 msec after the control circuit unit 11 is restarted).

As described above, according to the above-described embodiment, the control circuit unit 11 is temporarily stopped and carrier sense is performed immediately after the re-operation, so that the radio unit 3 reacts to the noise generated by the control circuit unit 11. It has an advantage that an accurate carrier sense operation can be performed.

[0012]

As is apparent from the above embodiment, the present invention is generated from the device itself by temporarily suspending the operation of the device itself before transmitting voice and data wirelessly and performing carrier sense after the suspension. This has the effect of avoiding the influence of noise.

Further, as is apparent from the above-described embodiment, the present invention provides a wireless device with a timer circuit section, an interrupt control section for performing an interrupt when the timer circuit section times out, and whether or not a frequency / channel is available. A wireless control unit that detects a carrier wave, and a wireless unit that receives a carrier wave and performs voice or data communication with the above-mentioned available frequency / channel. When the interrupt control unit interrupts, the wireless control unit is provided with a control circuit unit that performs carrier sense. Therefore, the control circuit unit is temporarily stopped during voice / data communication. Immediately after restarting, the carrier sense is performed, the control circuit section is suspended, and the carrier However, since accurate carrier sensing operation is performed before the wireless unit reacts to the noise generated by the control circuit unit, accurate carrier sensing can be performed without being affected by the noise generated by the control circuit unit. Have an effect.

[Brief description of drawings]

FIG. 1 is a configuration block diagram of a wireless device using a carrier sense method according to an embodiment.

FIG. 2 is a configuration block diagram of a wireless device using a conventional carrier sense method.

[Explanation of symbols]

 1, 11 control circuit unit 2 wireless control unit 3 wireless unit 15 interrupt control unit 16 timer circuit unit

Claims (2)

[Claims] 1. A carrier characterized in that the operation of the device itself is suspended before wirelessly transmitting voice and data, and carrier sensing is performed after the suspension to avoid the influence of noise generated from the device itself. Sense method. 2. A timer circuit section, and an interrupt control section which performs an interrupt when the timer circuit section times out,
The wireless control unit that detects whether or not a frequency / channel is vacant, the wireless unit that receives a carrier wave and performs voice or data communication with the vacant frequency / channel, and operates the timer circuit unit when carrier sense starts A wireless device comprising: a control circuit unit that causes the wireless control unit to perform carrier sensing when the circuit control unit itself is stopped and the interrupt control unit interrupts.